Re: [boost] ARM platform: undefined reference to __sync_fetch_and_add_4

From: Rob Desbois (rob.desbois_at_[hidden])
Date: 2008-04-04 09:31:32

On Thu, Apr 3, 2008 at 6:42 PM, Peter Dimov <pdimov_at_[hidden]> wrote:
>  > I cannot link against Boost libraries 1.35.0 built with CodeSourcery's
>  > ARM/GNU toolchain, although the build is successful.
>  ...
>
>
>  > undefined reference to `__sync_fetch_and_add_4'
>  > collect2: ld returned 1 exit status
>  >
>  > With assistance on the boost-build list I've ascertained that the
>  > problem is that GCC doesn't support __sync_fetch_and_add and the other
>  > atomic built-ins on ARM.
>  > An additional case for this may need to be added to
>  > boost/detail/sp_counted_base.hpp
>  >
>  > I don't know enough to patch boost for this, short-term or otherwise;
>  > can anyone offer any advice?
>
>  Two workarounds are available: define BOOST_SP_DISABLE_THREADS to disable
>  MT-safety for the reference count, or define BOOST_SP_USE_PTHREADS to use a
>  pthread_mutex.

Thanks Peter that compiles now.